Page 2 - lesson notes-Plant Growth& Movement

Secondary growth in plants is the function of lateral meristem that is vascular
cambium and cork cambium.

Growth is measurable

At cellular level, growth is the increase in amount of protoplasm. It is difficult to
measure the increase in amount of protoplasm but increase in cell, cell number and

cell size can be measured.
The parameter used to measure growth is increase in fresh weight, dry weight, length,

area, and volume and cell number. All parameters are not used for every kind of

growth.

Formative phase is also called as the phase of cell formation or cell division. It occurs

at root apex, shoot apex and other region having meristematic tissue. The rate of
respiration is very high in the cells undergoing mitosis division in formative phase.

Phase of Enlargement- newly formed cells produced in formative phase undergo
enlargement. Enlarging cells also develops vacuoles that further increase the volume

of cell.

Cell enlargement occurs in all direction with maximum elongation in conducting
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